Correlation between the 6-minute walking test and the cardiopulmonary exercise test in individuals with heart failure
DOI:
https://doi.org/10.33233/rbfex.v21i5.5405Keywords:
stress test, heart failure, 6-minute walking testAbstract
Objective: This study aimed to verify the correlation between the 6-minute walking test (6MWT) and the cardiopulmonary exercise test (CPET) in individuals with heart failure (HF), and to analyze the sensitivity of 6MWT in differentiating individuals from classes I, II, and III of the New York Heart Association (NYHA) functional classification system. Methods: Seventeen individuals (3 class I, 8 class II, and 6 class III) aged 48.09 ± 12.91 years with a left ventricular ejection fraction of 44 ± 11% and VO2peak of 25.18 ± 6.05 mL·kg-1·min-1 were assessed. Volunteers performed CPET on a treadmill; after an interval of 48 h to 6 months, they performed 6MWT. Pearson and Spearman correlations were used, and ANOVA was used to compare 6MWT variables between NYHA functional classes. An alpha of 5% was adopted as significant. Results: Significant correlations were found between distance walked in 6MWT and VO2peak (r = 0.70). Significant differences were found between NYHA functional classes regarding the distance walked in 6MWT. For walking performance, significant differences were found between NYHA classes I and II (p = 0.0001) and between classes I and III (p = 0.0001). Conclusion: The 6MWT is a simple and reliable method to assess the functional capacity of individuals with HF, proving to be a valid instrument for clinical practice.
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